package repository

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// TestMigrateLegacyDataFile 首次从历史命名(opsxloki.json)加载后必须升级到 lokistack.json:
// 新文件出现且内容完整,旧文件改名留档(不删数据)。
func TestMigrateLegacyDataFile(t *testing.T) {
	dir := t.TempDir()
	legacy := filepath.Join(dir, "opsxloki.json")
	seed := `{"schemaVersion":10,"users":[{"id":1,"username":"admin"}],"clusters":[],"hosts":[],"storages":[],"deployments":[],"collectors":[],"logs":[],"settings":[],"logSources":[],"alertRules":[],"alertDeliveries":[],"notifyChannels":[],"logPolicyGroups":[],"auditLogs":[],"dailyVolumeSnapshots":[]}`
	if err := os.WriteFile(legacy, []byte(seed), 0o600); err != nil {
		t.Fatal(err)
	}

	d := &JsonDB{dataFile: legacy}
	d.loadFromDisk()
	d.migrateLegacyDataFile()

	// 新文件存在且包含原有数据
	content, err := os.ReadFile(filepath.Join(dir, "lokistack.json"))
	if err != nil {
		t.Fatalf("未生成 lokistack.json: %v", err)
	}
	if !strings.Contains(string(content), `"admin"`) {
		t.Fatalf("迁移后数据不完整: %s", content[:min(len(content), 120)])
	}
	// 旧文件迁移成功后直接删除(不留档)
	if _, err := os.Stat(legacy); !os.IsNotExist(err) {
		t.Fatalf("旧文件应被删除: %v", err)
	}
	// dataFile 已切到新路径
	if filepath.Base(d.dataFile) != "lokistack.json" {
		t.Fatalf("dataFile 未切换: %s", d.dataFile)
	}
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}